Concrete mixer



a PN 19 1927' o. c. BARRYMORE ET A1.

CONCRETE MIXER 2 Sheets-Sheet l F ed se t. 25, 1926 f m2551152 April 19 1927' o. c. BARRYMORE ET AL CONCRETE MIXER Filed Sept. 25, 1926 2 Sheets-Sheet 2 Patented Apr.. 19, 1927.

UNITED STATES 1,625,762 PATENT OFFICE. l

ORSON C. BARRYMORE .AND REGINALL A. DADDISMAN, OIE SAN FRANCISCO, CALIFOR- NIA, .ASSIGNORS TO BARRYMORE CONCRETE MIXER CORPORATION, OF SAN FRAN- CISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

CONCRETE MIXER.

Application tiled September 23, 1926. Serial No. 137,186.

This application relates to concrete mixers and has for its objects improvements in the same which will provide a new method of mixing concrete, also apparatus therefor t which will be adapted for mounting on an automobile truck chassis to form substantially a gondola body for the truck which may be run under a bin and loaded in the usual wayalso such a mixer with detachable end l@ sections so that the shaft and mixing elements may easily be removed so as to leave a simple gondola body, also a portable mixer of this kind which will carry with it the required quantity of water for each mix so im that the concrete may be mixed upon reaching the job without piping water thereto, also such a gondola body concrete mixer which may be tipped longitudinally of. the body and provided with a discharge gate 2@ at the end of the same for dumping the mixed concrete or emptying the gondola.

body while on the truck chassis.

@ther objects will appear in the following description In the drawings hereto Fig. 1 is a side view of our mixer as mounted on a dump truck chassis with the dumping elements of the truckUomit-ted. Fig. 2 is a longitudinal sectional view of the mixer showing the arrangement of special paddles which effect the mixing. Fig. 3 is an end view of Fig. 2. Fig. t is an enlarged transverse section of Fig. 2 taken from line 4-4 thereof. Figs. 5 and 6 are respectively enlarged side and plan views of our special paddles designed to edecta diving spoon action into the material. and intermittent dropping of relatively small quantities of the mass in quick succession. Fig. 7 is a section of Fig. 6 taken along the line 7--7 thereof.

In further detail the invention'comprises a round bottomed trough 1 of substantially a size to form a gondola type truck body. rlthe trough is closed at its ends as indicated, suitably braced and mounted on a frame 2 in turn pivoted at the rear end at 3 to a truck chassis 4.

The sides and ends of the trough are 5 slanted inwardly at the upper edges as shown at 5 and the end plates 6 and 7 are removable from the line 8 for insertion or removal of a shaft 9 on which are mounted a spiral arrangement of special spoon shaped blades 10. The shaft is revolvably supported at opposite ends of the trough in bearings 11 and 12 bolted to the ends and each bearing 1s provided with a stuffing box as at 12 to prevent the entrance of sand or grit.

The shaft 9 is preferably of square section between the bearings, and theI spoon shaped blades 10, each attached to an arm 13 are formed with a clamp hub 14 clamped to the shaft.

The shaft extends through the bearing at the forward end of the trough and is itted with a gear 15 meshing with a pinion 16 of a train of gears on the truck arranged in any suitable manner not shown for receiving power from the transmission of the truck when desiring to start the mixer.

Along both sides of the trough are water tanks 17 preferably connected together by a pipe 18 so that upon filling as by a hose 19 into a filling plug 20 both will be filled,

vents being provided at 21.

These tanks are made of a capacity to hold suiiicient water to form a very wet' mixture with the normal concrete capacity of the mixing trough 1, but a sight gage is arranged as at 22 to denote the point of emptying of the tanks at which a standard mixture results.

To deliver Water from the tanks to the concrete mixing trough a plurality of valved outlets as at 23 are arranged under either or both tanks leading through the sides of the trough, and the valve handles 24 all connected by a rod 25 for simultaneous action. The valves are normally closed by means of a spring as at 26 and may be opened through means such as a chain 27 available for pulling from the cab 32 by the truck driver.

The mixing blades and arms are devised of a particular form so as to enter the concrete with a progressive @leaving action, preferably beginning 'with the tips of the blades.

Figures 4, 5, 6 and 7 indicate the important features, Fig. 4 showing the arched shape of the arm and the other figures the detailed shape of arm and blade.

The arm 13 is arched with the concave The blade is made separable from the arm as indicated and presents in plan, as seen in Fig. 6, a heart or spade-shaped device terminating in a point with the ridire of the wedge 13 extending thereto. Adzjacent the point the sides of the blade slant away from the ridge so'as to spread the mass in entering, while towards the rear of the blade at both sides of the ridge are formed concave portions 10 provided with upwardly curved lips 10".

This form of blade and arm provides for easy entry into the concrete, and an outward spreading of the mass starting from the tip of the blades, then a'liftin of some of the material and dropping bac c into the body of the mass.

Also the blades are arranged spiralhT along the shaft so that this outward spreading of the mass and dropping begins at one -end of the trough and works toward the other end with a result that the material is given a slight movement toward one end of the trough and in consequence a current is set up to carry the material back again, and thus resulting in a new method of mixing concrete so far as is known as it is quite distinct from the violent splashing or stirring in direct opposition to large aggregates occasioned by other concrete mixers.

At the rear end of the trough, situated at a point below the shaft 9 is a gate 28 hinged to the end of the trough at`29 and clamped thereto by screws as at 30, to provide a discharge for lthe contents of the trough upon tipping the forward end of same upward through a connection of the frame 2 as at points 31 with any desired type of dumping mechanism carried by the truck, but not shown as not specifically forming part of the invention.

In operation, the truck upon which ythe apparatus is mounted is run under a bin and the trough filled with concrete mix and cement to or somewhat above the shaft` the tanks are filled with water and the load taken to the job like any common truck load of sand or rock. Once at the job the truck is stopped, the water turned into the trough and the mixer startedr by engagement of the gears with power from the truck; After mixing is completed the gate 28 is released and the trough tipped by the truck dumping mechanism to discharge the mixed concrete to the place desired.

After dumping, the truck may be pulled out a bit, and the. balance of the water in tanks run ofi to wash out the trough and gate seat.

The presence of the mixing apparatus within the trough and the driving gears at one end does not affect the use of the trough as a regular hauling and dump truck body.

for dry material, but if desired the ends of the trough being partedv along the line 8 may easily be released by removing the bolts indicatcd,the bearings 11 and 12 also unbolted, and the shaft with its blades, hearings andgears lifted as a unit out of the trough, after which the end plates are replaced and a pair of common round flanges .(not shown) bolted over the bearing openings. l

Thus, the truck body is quickly converted from a special concrete mixing truck to a plain dump truck or vice versa.

l/Ve claim- 1. Concrete mixing apparatus comprising a trough mounted lengthwise on a motor truck and pivoted directly to the rear portion of the chassis frame of the truck for tipping upwardly at its forward end, a mixer shaft in the trough rotatably sup orted in bearin s at opposite ends thereo and arrange for driving outside of the forward end of the trough, a spur gear secured to said shaft engaging adriving gear mounted on the truck between the cab of the truck and the forward end of the trough so that the spur gear may be lifted from said driv- .ing gear upon tipping the truck.

2. Concretemixing apparatus comprising a trough mounted lengthwise on a motor truck and pivoted to the rear portion of the chassis frame of the truck for tip ing upwardly at its forward end, a mixer s aft in the trough rotatably supported in bearings at opposite ends thereof, and arranged for driving outside of the forward end of the trough, said trough provided with end walls supporting 'said bearings and divided along horizontal lines adjacent said bearings and removably secured in place on the trough.

3. Concrete mixing apparatus comprising a trough provided with mixing blades mounted therein, a pair of longitudinally arranged water tanks respectively secured along opposite long sides of the trough, and means for controlling discharge of water from the tanks to the trough.

4. A structure as specified in claim 3 plus a cross connection to the tanks wherebyboth may be filled simultaneously.

5. Concrete mixing apparatus comprising a trough mounted lengthwise of and on a motor truck, and mixing apparatus mounted within said trough, said trough being open on top and the sides and ends thereof being substantially vertical near the top surmounted by a relatively low inwardly slanting` iiange therearound.

6. A concrete mixer comprising a trough provided with a rotatable shaft extending therein and a series of paddle blades arranged spirallythercon, said blades being substantially of a pointed shovel shape and each mounted at the end of an arm secured to the shaft and lying flatwise in the arc of rotation to lift some of the batch upon up-` l www@ Word movement so as to cause a spiral shovoling lifting fiction to concrete in the trough upon revolving the shaft.

7. A structure as specified in claim 6 in which the pointed shovel shaped blades are provided with a central ridge extending subsutantially. from the point rearward to form o Adoecting bovol at the forward end and :i pair of shallow bowls is provided at thel 'rearward portion of the shovel, ono lying 

